| 摘要: |
| 为了解长江口刀鲚(Coilia nasus)耳石中碳、氧稳定同位素的特征及其可能反映出的生态学意义,作者利用稳定同位素质谱分析技术, 首次对长江口刀鲚幼鱼的耳石进行碳、氧稳定同位素的初步研究。结果显示, δ13C 和δ18O 分别为–12.1±1.8(‰VPDB)和–7.9±1.2(‰VPDB), 总体上δ13C 波动较大, 而δ18O波动较小。基于个体的δ13C 和δ18O 散点分布可将本研究中的刀鲚归为两个组, 可能起源于长江中两个不同孵化场水域的群体, 其中δ18O 显示出两组刀鲚所经历环境积温上的差异, 反映出两者起源水域温度环境的不同; 而δ13C 的差异说明两组刀鲚在饵料组成上的有所差异。 |
| 关键词: 刀鲚(Coilia nasus) 耳石 稳定同位素 δ13C δ18O |
| DOI：10.11759//hykx20140622001 |
| 分类号: |
| 基金项目:国家自然科学基金资助项目(31372533); 江苏省科技项目(自然科学基金)(BK20131089); 农业部948 项目(2014-S6); 江苏省普通高校研究生科研创新计划项目(CXLX12_0266) |
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| Characteristics of C and O stable isotope in otolith of juvenile Coilia nasus from the Changjiang River Estuary |
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| Abstract: |
| For better understanding of the characteristics of stable carbon (δ13C) and oxygen (δ18O) isotopes in the otolith of Coilia nasus and the possible ecological significances, the analysis of otolith stable isotope ratios of δ13C and δ18O was conducted using an isotope ratio mass spectrometry on C. nasus juveniles collected from the Changjiang River Estuary. The otolith revealed δ13C and δ18O values of –12.1±1.8 (‰VPDB) and –7.9±1.2 (‰VPDB), respectively. Unlike δ18O, δ13C generally varied in a relatively wide range. Two groups of the fish could be separated based on scattered distribution by otolith δ13C and δ18O values of all C. nasus individuals in the present study, suggesting possible different natal origins (i.e. spawning/nursery areas) in the Changjiang River. The different environments with different water temperature and food organism composition might be experienced by the two groups of C. nasus fish. |
| Key words: Coilia nasus otoliths stable isotope δ13C δ18O |
